Decomposition and substrate quality of leaf litters and fine roots from three exotic plantations and a native forest in the southwestern highlands of Ethiopia

Lemma, Bekele; Nilsson, Ingela; Kleja, Dan Berggren; Olsson, Mats; Knicker, Heike

doi:10.1016/j.soilbio.2007.03.032

Cited by 95 publications

(70 citation statements)

References 41 publications

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“…72 ppm, corresponding to secondary carbinol C (i.e. C-2, C-3 and C-5 of pyranoside rings) in cellulose and hemicellulose (Almendros et al, 2000;Keeler et al, 2006;Lemma et al, 2007;Conte et al, 2010). Resonances at ca.…”

Section: Resultsmentioning

confidence: 99%

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Properties of dissolved and total organic matter in throughfall, stemflow and forest floor leachate of central European forests

et al. 2015

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Abstract. We present the first investigation of the composition of dissolved organic matter (DOM) compared to total organic matter (TOM, consisting of DOM, < 0.45 µm and particulate organic matter 0.45 µm < POM < 500 µm) in throughfall, stemflow and forest floor leachate of common beech (Fagus sylvatica L.) and Norway spruce (Picea abies (L.) H. Karst.) forests using solid-state 13 C nuclear magnetic resonance (NMR) spectroscopy. We hypothesized that the composition and properties of organic matter (OM) in forest ecosystem water samples differ between DOM and TOM and between the two tree species.The 13 C NMR results, derived from 21 samples, point to pronounced differences in the composition of DOM and TOM in throughfall solution at the beech sites, with TOM exhibiting higher relative intensities for the alkyl C region, which represents aliphatic C from less decomposed organic material compared to DOM. Furthermore, TOM shows lower intensities for lignin-derived and aromatic C of the aryl C region resulting in lower aromaticity indices and a diminished degree of humification. Across the ecosystem compartments, differences in the structural composition of DOM and TOM under beech lessened in the following order: throughfall > stemflow ≈ forest floor leachate.In contrast to the broadleaved sites, differences between DOM and TOM in throughfall solution under spruce were less pronounced and spectra were, overall, dominated by the alkyl C region, representing aliphatic C. Explanations of the reported results might be substantiated in differences in tree species-specific structural effects, leaching characteristics or differences in the microbial community of the tree species' phyllosphere and cortisphere. However, the fact that throughfall DOM under beech showed the highest intensities of recalcitrant aromatic and phenolic C among all samples analysed likely points to a high allelopathic potential of beech trees negatively affecting other organisms and hence ecosystem processes and functions.

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Section: Resultsmentioning

confidence: 99%

“…In all samples, a maximum peak in the carboxyl C region at ca. 172 ppm indicated the presence of carboxylic acids, amides and esters originating from compounds such as cutin, proteins and hydrolysable tannins (Lemma et al, 2007).…”

Section: Resultsmentioning

confidence: 99%

Properties of dissolved and total organic matter in throughfall, stemflow and forest floor leachate of central European forests

et al. 2015

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“…The analysis showed that initial tissue chemistry explained the greatest proportion of variance in decomposition rate (85%), while environmental variables, most notably temperature, precipitation and actual evapotranspiration (AET) played a secondary role. Since Silver and Miya's analysis, fine root decomposition studies have largely focused on the effects of litter quality on rate of decay and generally support the notion that litter quality regulates microbial activity and thus decomposition (Chen et al 2001;Lemma et al 2007). In general, decay rates of fine roots are positively correlated with initial concentrations of Ca, Mg, Mn, N and P and negatively correlated with C:N, lignin:N, cellulose, and phenolic compounds including tannins, and lignin (Berg et al 1998;John et al 2002;Jalota et al 2006;Wang et al 2010;Tong et al 2012;García-Palacios et al 2016;Guerrero-Ramírez et al 2016;Roumet et al 2016).…”

Section: Factors That Influence Fine Root Decompositionmentioning

confidence: 95%

“…Later stages of decomposition are thought to be more heavily influenced by interactions between N content and chemical form and components of root cell walls including lignin, cellulose, and suberin (John et al 2002;Yang et al 2004;Tripathi et al 2006;Lemma et al 2007). Increases in soil N availability can suppress decomposition of phenolic compounds contained within cell walls (Berg 2000;Wang et al 2004).…”

Section: Factors That Influence Fine Root Decompositionmentioning

confidence: 99%

Maintaining connectivity: understanding the role of root order and mycelial networks in fine root decomposition of woody plants

Beidler

Pritchard

2017

Plant Soil

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Background The predictive power of climate models is limited by an incomplete understanding of the controls on fine root decomposition and thus belowground carbon cycling. To more accurately model rates of decay, fine root heterogeneity needs to be addressed in fine root decomposition studies. Branching order integrates both structural and chemical properties that are important in indicating litter quality and decay rate. Scope We discuss current views on the controls and patterns of fine root decomposition in combination with recent findings related to the effects of branching order and mycorrhizal decomposition. We examine the counterintuitive finding that nitrogen rich, lower order roots decompose more slowly than woody, higher order roots in temperate and subtropical forests. ConclusionsWe posit that slower decomposition of first and second compared to higher order roots might be caused by the poor carbon quality associated with higher concentrations of phenols in lower order roots or by inhibition of saprophytes by the mycorrhizal fungi that often preferentially inhabit these roots. Alternatively, apparent recalcitrance of lower order roots could be an experimental artifact caused by severing pre-mortem mycelial connections during sample processing, or exclusion of animals that graze fungal structures by the small mesh sizes characteristic of litterbags. To better predict the residence time of the carbon contained in the entire fine root pool, existing methods should be applied to individual root orders when practical. New methods for characterizing decomposition of undisturbed roots that have senesced naturally are greatly needed.

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“…Changes in soil properties, in particular increases in the concentration of toxic minerals, can also affect the decomposition of organic residue, since they affect the structure and activity of microbial communities in the soil [19,20]. The physical and chemical properties of the soil are known to influence microbial communities [21].…”

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confidence: 99%

Changes in the Mineralisation of Nutrients and Sunflower Biomass in Soil Irrigated with Water from Oil Exploration in a Semi-Arid Environment

Sousa¹,

Crisostomo²,

OlmarBallerWeber³

et al. 2017

IJEAB

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Decomposition and substrate quality of leaf litters and fine roots from three exotic plantations and a native forest in the southwestern highlands of Ethiopia

Abstract: El artículo seleccionado no se encuentra disponible por ahora a texto completo por no haber sido facilitado todavía por el investigador a cargo del archivo del mismo.

Cited by 95 publications

References 41 publications

Properties of dissolved and total organic matter in throughfall, stemflow and forest floor leachate of central European forests

Properties of dissolved and total organic matter in throughfall, stemflow and forest floor leachate of central European forests

Maintaining connectivity: understanding the role of root order and mycelial networks in fine root decomposition of woody plants

Changes in the Mineralisation of Nutrients and Sunflower Biomass in Soil Irrigated with Water from Oil Exploration in a Semi-Arid Environment

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